Speedometer surges 10-20 mph while in drive, foot on brake and no movement from vehicle. Speedometer reads 0 in park and acts normally when moving. There is a new whining sound noticed also coming around alternator area but may not be associated but coincidental new problem. Just purchased vehicle and got good report from mechanic during pre-purchase maintenance check 1 week ago. Fluid level checks good.
Transmission shifts randomly while in drive, no movement. What would be cause? on 2006 Chrysler Pacifica
by cdavis9133 in Vancouver, WA on July 06, 2014
ANSWER by DonziGT230 , July 06, 2014
Probably a bad speed sensor. They're generally cheap and easy to replace and nearly impossible to test when they're intermittent. I'd just replace it and see. I don't know on that specific car, but it's usually a wire connector and 1 or 2 screws and generally near the output shaft of the transmission above fluid level.